| 复合材料层合结构频率约束的可靠性优化设计(英文) |
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| 作者单位： | 北京航空航天大学航空科学与工程学院 北京100083 |
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| 摘 要： | The reliability based optimization （RBO） issue of composite laminates trader fundamental frequency constraint is studied. Considering the tmcertainties of material properties, the frequency constraint reliability of the structure is evaluated by the combination of response surface method （RSM） and finite element method. An optimization algorithm is developed based on the mechanism of laminate frequency characteristics, to optimize the laminate in terms of the ply amount and orientation angles. Numerical examples of composite laminates and cylindrical shell illustrate the advantages of the present optimization algorithm on the efficiency and applicability respects. The optimal solutions of RBO are obviously different from the deterministic optimization results, and the necessity of considering material property uncertainties in the composite structural frequency constraint optimization is revealed.
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| 关 键 词： | 结构力学 振动 基准频率 复合薄板结构 可靠性 响应面法 |
| 收稿时间： | 3 September 2007 |
Reliability Based Optimization of Composite Laminates for Frequency Constraint |
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| Authors: | Wu Hao Yan Ying Liu Yujia |
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| Institution: | School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China |
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| Abstract: | The reliability based optimization (RBO) issue of composite laminates under fundamental frequency constraint is studied. Consid- ering the uncertainties of material properties, the frequency constraint reliability of the structure is evaluated by the combination of re- sponse surface method (RSM) and finite element method. An optimization algorithm is developed based on the mechanism of laminate frequency characteristics, to optimize the laminate in terms of the ply amount and orientation angles. Numerical examples of composite laminates and cylindrical shell illustrate the advantages of the present optimization algorithm on the efficiency and applicability respects. The optimal solutions of RBO are obviously different from the deterministic optimization results, and the necessity of considering mate- rial property uncertainties in the composite structural frequency constraint optimization is revealed. |
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| Keywords: | fundamental frequency reliability based optimization (RBO) response surface method (RSM) basic random variable (BRV) failure probability deterministic optimization |
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